Loop for radioreception



Sept. 15, 1925.

L. E. GOULD LOOP FOR RADIORECEPTION Filed Feb, 28

Patented Sept. 15, 1925.

LAWRENCE E. GOULD,

PATENT OFFICE.

OF CHICAGO, ILLINOIS.

L06? FOB RADIOREOEFTION.

Application filed. February 28, 1925. Serial No. 12,277.

To all whom it may concem:

Be it known that I, LAWRENCE E. GOULD,

a citizen of the United States, and a resident of Chicago, in the countyof Cook and State of Illinois, have invented certain new and usefulImprovements in Loops for Radioreception, of which the followlng is aspecification, reference being had to the accom anying drawings. Mginvention relates to radio receiving loops, and has for its object toprovide an improved loop that will possess superior energy, collectingability and directlonal selectivity as compared with prior devices ofthe kind. I accomplish this object as illustrated in the drawings, andas hereinafter described. What I regard as new is set forth in theclaims.

In the accompanying drawings Fig. 1 is a front elevation of my improvedloop;

Fig. 2 is a horizontal section on line 22 of Fig. 1;

Fig. 3 is a horizontal section on line 3--3 of Fig. 1;

Fig. 4; is a transverse section on line 4-4 of Fig. 1; and

Fig. 5 is a vertical section on line 5-5 of Fig. 3.

The efficiency of a radio receiving loop for its intended purpose isdependent upon a number of factors, such as the size and shape of theloop structure, and the length, size, shape and electricalcharacteristics of the electrical conductor used. The effectiveness ofa-loop as an energy collecting medium attached to a radio receiving andtuning apparatus also is dependent on the potential difference not onlybuilt up in the loop, but delivered to the input terminals of thereceiving set. All material used in the construction of the loop, andnot an actual part of the potential building circuit, absorbs energy, orshort-circuits the working conductor, thereby reducing the effectivepotential built up at the set terminals. Likewise the corona effects, orfields around each active conductor may be so superimposed as' to have acumulative electrical capacity 'eflect which increases the effectiveresistance, or partially short-circuits the potential, therebyincreasing the fundamental wave length of the loop as an energycollecting device, and narrowing the band of wave lengths to which itmay be tuned with 5 any given set.

With the foregoing considerations in mind, my improved loop has beendesigned to provide maximum length of conductor with maximum wirespacing to include transpositions and still occupy a narrow plane. Suchmaterials are used that one or more turns may be made of activeconductor, strong enough to support a number of additional turns ofsmaller cross-section, thereby providing a self-sustaining loopcharacterized by the absence of, or the use of a minimum of, extraneousenergy absorbing materials. A loop of this character may be, andpreferably is, built of bare conductor, thereby cutting down the waveabsorbing material adjacent to the conductor, as Well as enabling theactive conductor to be tapped at the actual nodal point, or at any otherdesired point or points, by means of a flexible terminal or externalconnection, so that the receiving set with which the loop is connectedmay be served to the best advantage. Furthermore the use of a bareconductor admits of securing the wire composing the turns of the loop atsuch points as may be necessary to provide them with such support as maybe required for spacing or other purpose by swaging the wire intopockets or specially formed slots in spacing or supporting members,thereby further reducing the use of extraneous ener y absorbin materialin the construction 0 the loop.

l roceeding now to a description of my improvements as embodied in theloop illus trated in the accompanying drawings, which realizesthedesirable characteristics above pointed out, 6 indicates a base ofsuitable size and shape to provide a stable support for the loop, saidbase being referably made of wood. Rising centrally From the base 6, andpreferably secured thereto by providing its lower end with screw-threadsada ted to screw into a threaded socket in the ase, is a spindle 7, alsopreferably of wood, which tends through the sleeve and into the groove8. The sleeve may however be removed turnin it so that the inner end ofthe screw 11 registers with the channel 9. A binding post 12 is securedto the sleeve 10 at such a point that its inner end, which is seen by anut 13, lies in the ove 8, as best shown in Fig. 3. The binding post,therefore, does not interfere with rotation of said sleeve, f

and rotates with it about the spindle 7.

The loop proper, which is preferably circular in genera contour, but maybe square or of any other suitable form, comprises an outer orsupporting turn 14 of solid or tubular wire of comparatively lar ecross-sec tional area, and is best made 0 aluminum. The end portions 15,16 of the outer turn 14 are spaced apart and firmly secured to thesleeve 10 so as to rotate therewith, by clamps 17, 18, respectively, asbest shown in Figs. 1 and 2, and the clamp 17 carries a binding post 19that serves also as a securing device for said clamp. A screw 20 securesthe clamp 18, as shown in Fig. 2.

The loop also comprises a number; of turns 21 of considerably finerwire, wound in spiral form, the outer end of such finer wire beingconnected, preferably by soldering, with the inner end ortion 16 of thewire 14, as shown at 22 in Fig. 1. The innermost turn 21 has a lead 23that is connected with the binding post 12.

The outermost turn 14 is made strong and stiff or heavy enough not onlyto be selfsustaining, but also to support the inner turns, so that theloop as a whole is selfsustaining,-that is to say, the upper ortion ofthe loop receives its support from t e outer turn 14, which is itselfsupported only at the bottom. The several turns 21 are, however, held inspaced relation to each other and to the turn 14, by acers 24, 25, 26,in the form of strips of suitable dielectric material, having notches orpockets 27 in their side margins and inner ends to receive the turns 21.The spacer 24 is firmly secured at its lower end in the sleeve 10 sothat it rotates therewith and with the supporting outer turn 14. Thespacers 25, 26 have notches 28 in their outer ends also, to receive theturn 14, as best shown in Fig. 4. The notches 27 are made by boringholes of the proper size in the spacer strips near their margins andthen sawing through the margins to such holes in such manner as toprovide passages throu h which the wire may be forced to fit tig tly inthe recesses so by gin are staggere formed. The wire of.the outer turn14 is best secured in the notches 28 by screws 29, as shown in Fig. 4. Iprefer to use three spacers placed equal distances apart, but the numberand position of such spacers may be varied, if desired.

It will be seen from Figs. 4 and 5 that the notches 27 in the sidemargins of the spacers are so disposed that those in one mar- ,withreference to those in the opposite margin, and that the turns 21 are sowound that they are disposed principally in triangular groups, whicharrangement provides the widest spacing between adaoming turns, theadvantage of'which in ra io loops is well recognized.

As has been pointed out, the wire of all the turns is bare and toprovide for making connection with the loop at any desired point aflexible wire 30 is connected at one end with a bindin post31'secured'to the sleeve 10, as shown in Fig. 3, and at its other endcarries a clamp 32 that may be attached to any of the turns 21, asdesired.

From the foregoing description it will be seen that I have provided aself-sustaining loop in which the use of energy absorbing materials isreduced to the minimum, and one of such design that the conductor may bemade of maximum length, and with the maximum wire spacing while stilloccupying a narrow plane. Obviously the same general construction mayalso be used for a flat spiral receiving loop or tuning inductance.While I prefer to arrange the supporting wire 14 in a sin le turn, myinvention is not limited to t at arrangement, as a pluralit of turnsmabe used. It should be un erstood that w ile I have described myinvention as a radio receiving loop, it may also be used for sendin andthe claims hereinafter made are there ore to be construed accordingly.

What I claim as my invention and desire to secureby Letters Patent, is

1. A radio receiving loop comprising a supporting turn of conductingwire, a finer conducting wire one end of which is connected with oneterminal of said supporting turn, said finer wire being wound to form aplurality of turns, spacing means serving to space the several turnsapart and support the turns of finer wire from said supporting turn, anda support on which said supporting turn is mounted.

2. A radio receiving loop comprising a self sustaining outer turn ofconducting wire, a finer conducting wire one end of which is connectedwith one terminal of said outer turn, said finer wire being wound toform a plurality of turns disposed within said outer turn, spacing meansbetween the several turns and supporting the inner turns from said outerturn, and a support on which said outer turn is mounted.

3. A radio receiving loop comprising a. supporting turn of bareconducting wire, a finer bare conducting wire one end of which isconnected with one terminal of said sup orting turn, said finer wirebeing wound to orm a plurality of turns, spacing means serving to spacethe several turns apart and support the turns of finer wire from saidsupporting turn, and a support on WhlCh sai supportmg turn is mounted.

4. A radio receiving loop comprisln a self sustaining outer turn of bareconducting wire, a finer bare conducting wire one end of which isconnected with one terminal of said outer turn, said finer wire beingwound to form a plurality of turns disposed within said outer turn,spacing means between the several turns and supporting the inner turnsfrom said outer turn, and a support on which said outer turn is mounted.

5. A radio receiving loop comprising a supporting turn of conductingwire, a finer conducting wire one end of which is connected with oneterminal of said supporting turn, said finer wire being wound to form aplurality of turns, spacing means serving to space the several turnsapart in trlangularly disposed groups and support the turns of finerwire from said supporting turn, and a support on which said supportingturn 1s mounted.

6. A radio receiving loop comprlsing a self sustaining outer turn. ofconducting wire, a finer conducting wire one end of which is connectedwith one terminal of said outer turn, said finer wire being wound toform a plurality of turns disposed with1n said outer turn, spacing meansbetween the several turns and supporting the inner turns from said outerturn in triangularly disposed groups, and a support on which said outerturn is mounted.

7. A radio receiving loop comprising a supporting turn of conductingwire, a rotatable member to which the end portions of said supportingwire are attached, a finer conducting wire one end of which is connectedwith one terminal of said supporting turn, said finer wire being woundtoform a plurality of turns, and spacing means serving to space theseveral turns apart and support the turns of finer wire from saidsupporting turn.

8. A radio receiving loop comprising a self sustaining outer turn ofconducting wire, a rotatable member to which the end portions of saidsupporting wire are attached, a finer conducting wire one end of whichis connected with one terminal of said outer turn, said finer wire beingwound to form a plurality of turns disposed within said outer turn, andspacing means between the several turns and supporting the inner turnsfrom said outer turn.

9. A radio receiving loop comprising a sup orting turn of conductingwire, a rotata 1e member to which the end portions of said supportingwire are attached, a finer conducting wire one end of which is connectedwith one terminal of said. supportlng turn, said finer wire being woundto form a plurality of turns, spacing means serving to space the severalturns apart and support the turns of finer wire from said supportlngturn, and a connector attached to said rotatable member and adapted toconnect with said finer wire.

10. A radio receiving loop comprising a supporting turn of conductingwire, a finer conducting wire one end of which is connected with oneterminal of said supportlng turn, said finer wire being wound to form a.plurality of turns, spacing members serv ng to space the several turnsapart, said spacing members having notches in their opposite margins toreceive the finer wire and belng connected with said supporting turn.and a support on which said supporting turn is mounted.

11. A radio receiving loop comprising a supporting turn of conductingwire, a finer conducting wire one end of which is connected with oneterminal of said support ing turn, said finer wire being wound to form aplurality of turns, spacing members servlng to space the several turnsapart, said spacing members having notches in their opposite margins toreceive the finer wire and having notches in their outer ends to receivesaid supporting turn, and a support on which said supporting turn ismounted.

12. A radio receiving loop comprising a supporting turn of conductingwire, a finer conducting wire one end of which is connected with oneterminal of said supporting turn, said finer wire being wound to form' aplurality of turns, spacing means serving to space the several turnsapart and support the turns of finer wire from said supporting turn, arotatable support on which said supporting turn is mounted, and aspacing member for the finer turns secured to said support.

13. A radio receiving loop comprising a base having an upright spindle,a sleeve journaled on said spindle, a supporting turn of conducting wirehaving its end portions secured to said sleeve, a spacing member securedto said sleeve, a finer conducting wire oneend of which is connectedwith one terminal of said supporting turn, said finer wire being woundto form a plurality of turns and spacing members serving to space theseveral turns apart and support the turns of finer wire from saidsupporting turn.

14. A radio receiving loop comprising a base, a spindle secured thereto,said spindle having an intermediately disposed annular groove, a sleevejournaled on said spindle, a supporting turn of conducting wire havinits end portions secured to said sleeve, :1. ner conducting wire one endof which is 5 connected with one terminal of said sup porting turn, saidfiner wire being wound to form a plurality of turns, spacing meansserving to space the several turns apart and support the turns of finerwire from said supporting turn, and a binding post carried 10 by saidsleeve opposite said groove and core nected with the other end of saidfiner wile.

LAWRENCE E GOULD

